Key takeaways
- Pro: Two batteries included at this price point eliminates mid-job downtime on small tasks.
- Pro: Lowest cost entry into battery trimming among full-size string trimmers here.
- Con: 2.0Ah capacity struggles against dense weeds or overgrown edges; runtime drops sharply under load.
What's inside
A battery grass trimmer solves one clear problem: it lets you edge, trim, and keep lawn borders sharp without dragging an extension cord or maintaining a gas engine. The buyer’s challenge is finding a tool whose runtime, cut width, and weight actually match the yard in front of them. Prices for the eight models compared here range from about $34 to $159, and that spread reflects real differences in voltage, battery capacity, and head versatility—not just brand markup.
What separates a good pick from a disappointing one in 2026 is straightforward once you ignore marketing language. A trimmer with a 2.0Ah battery paired with a single 12-inch head will handle a tidy suburban strip but stall on a fenceline of goldenrod. A 40V tool with a telescoping shaft and a 13-inch swath will chew through that same fenceline but feels like a workout on a small courtyard. Owner feedback consistently flags the gap between the advertised specs and how a tool performs once you attach the battery and walk ten minutes. This roundup compares those published numbers, current street prices, and recurring themes from real buyers to narrow the field.
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Quick Picks
| Product | Best for | Price |
|---|---|---|
| 20V 2-Battery String Trimmer | Smallest budgets, flat yards | $35.99 |
| WORX WG163 | Trimmer and edger in one under $70 | $65.45 |
| MZK 20V 12-Inch | Higher runtime at a mid price | $49.99 |
| WeGofly 4-in-1 | Maximum versatility per dollar | $85.99 |
| WORKPRO 7.2V Grass Shear | Shrub shaping and tight corners | $33.99 |
| EWORK 2-in-1 | Unbranded trimmer/edger value | $89.99 |
| BLACK+DECKER LST136 | Larger properties, tall users | $159 |
| BLACK+DECKER LST300 | Brand reliability, easy feed line | $69 |
How We Picked
Four criteria drove every comparison. First, voltage and battery capacity together determine whether a tool finishes a job or quits mid-pass—so we weighted the Ah rating relative to the head width. Second, total weight after the battery is mounted matters more than the spec-sheet number alone, because owners report fatigue as the primary reason for returning budget trimmers. Third, included accessories (extra batteries, edger head, charger) shift the real cost below or above the listed price. Fourth, the availability of replacement line and compatible batteries affects long-term ownership, particularly on platforms with narrow accessory ecosystems.
The 8 Best Battery Grass Trimmers in 2026
20V Electric Cordless String Trimmer, 2× 2.0Ah Battery
This is the cheapest complete package on the list, and it comes with two 2.0Ah batteries so you can swap and keep working. For a homeowner trimming a half-acre of neat lawn borders, it does the job without spending more than a gas string trimmer’s annual fuel cost. Owner reviews praise the value but note the 2.0Ah cells drain quickly on anything thicker than grass.
- Pro: Two batteries included at this price point eliminates mid-job downtime on small tasks.
- Pro: Lowest cost entry into battery trimming among full-size string trimmers here.
- Con: 2.0Ah capacity struggles against dense weeds or overgrown edges; runtime drops sharply under load.
Skip this trimmer if your property has more than light lawn maintenance. The power band suits tidy suburban borders, not brush or thick crabgrass patches where sustained torque matters.
WORX 20V 12″ 2-in-1 String Trimmer & Edger WG163
The WG163 converts from a string trimmer to a lawn edger with a single adjustment, making it the strongest sub-$70 pick for homeowners who want two tools in one. Owners highlight the 12-inch cut swath and the convenience of flipping the head rather than carrying separate units. The trade-off is that it runs on WORX’s dedicated 20V battery platform, which means existing batteries from another brand will not slot in.
- Pro: True 2-in-1 design saves the cost of a standalone edger tool.
- Pro: Established brand with wide replacement-line and battery availability.
- Con: Proprietary battery platform locks you into WORX accessories.
Skip it if you already own batteries from Ryobi, Greenworks, or another platform and do not want a separate charger occupying outlet space.
MZK 20V 12-Inch Cordless Weed Wacker, 8000 RPM, 4.0Ah Battery
The 4.0Ah battery is the headline spec: it roughly doubles runtime compared to the 2.0Ah cells found in budget trimmers at similar price points. The 8000 RPM motor keeps the line cutting cleanly through thicker stalks without bogging. Owners report good performance on fencelines and ditch edges, though the single-battery package means no swap option when the pack does run dry.
- Pro: 4.0Ah capacity handles larger sections on a single charge.
- Pro: 8000 RPM motor maintains line speed through dense growth.
- Con: Only one battery included, so a dead pack means a full recharge wait.
Skip this model if your trimming sessions regularly exceed 20 minutes and you cannot carry a recharge mid-task. A second battery sold separately adds cost that narrows the value gap with pricier options.
WeGofly 13″ 4-in-1 Cordless String Trimmer / Lawn Edger / Lawn Mower / Brush Cutter
At $85.99, the WeGofly bundles four heads, two 21V 6.0Ah batteries, steel gears, and a charger into a 5.2-pound package. The 6.0Ah cells are the largest-capacity batteries on this list, and the steel gear drive is unusual at this price—most budget trimmers use plastic. This suits a homeowner wanting one tool to edge, trim, mow small patches, and clear brush without a gas engine.
- Pro: Four heads and dual 6.0Ah batteries cover nearly any yard task in one purchase.
- Pro: Steel gears increase durability over plastic-drive competitors.
- Con: Feature breadth means no single head is as refined as a dedicated tool.
Skip it if you already own a trimmer and only need an upgrade in one function. The value is in consolidation, not peak performance per attachment.
WORKPRO 7.2V Cordless Grass Shear & Shrubbery Trimmer
This is not a string trimmer in the traditional sense. At 7.2V, it is a handheld shear meant for shaping shrubs, cleaning up flower-bed edges, and reaching corners a full-size wacker cannot. The $33.99 price makes it an easy supplement to a primary trimmer, but it will not handle lawn borders more than a few inches tall.
- Pro: Lightweight and low-profile enough for precision work around beds and stepping stones.
- Pro: Cheapest complete battery tool on the list.
- Con: 7.2V power band limits it to soft growth and light trimming only.
Skip it entirely if you need a primary trimmer. This is a finishing tool, and owners who purchase it as a main wacker consistently express disappointment.
EWORK 2-in-1 Cordless Weed Wacker & Edger, 20V 12″
The EWORK pairs a 20V motor with a 12-inch trimmer head that converts to an edger, a configuration common among value-focused sellers. Pricing at $89.99 places it above the WORX WG163 despite similar specs, and the brand lacks the retail presence and service network of established manufacturers. Owners who choose it cite straightforward performance, but long-term support remains uncertain.
- Pro: 2-in-1 conversion adds edging capability without a second tool.
- Pro: Standard 20V voltage aligns with widely available replacement line sizes.
- Con: Minimal brand infrastructure means limited warranty support and hard-to-find parts.
Skip it if after-sale service matters to you. At this price the WORX WG163 delivers a comparable feature set with better brand backing.
BLACK+DECKER 40V MAX 13″ String Trimmer Edger LST136
The LST136 is the most powerful trimmer on this list at 40V, and its telescoping pole adjusts to fit different user heights—critical for people who find fixed-length shafts cause back strain. The 13-inch swath covers ground quickly, and the 2-in-1 edger conversion adds function without a second tool. At $159 it commands a premium, but that premium buys power and comfort that smaller tools cannot match.
- Pro: 40V platform delivers the highest cut power among these eight trimmers.
- Pro: Telescoping pole eliminates awkward bending for taller users or uneven terrain.
- Con: Price is more than double the budget picks, and heavier than the lighter models.
Skip it if your yard is under a quarter-acre with mostly flat lawn. The added power and reach justify cost on larger properties but represent unnecessary weight and expense on a small strip.
BLACK+DECKER 20V MAX String Trimmer & Edger LST300
The LST300 sits in the sweet spot between budget tools and the 40V sibling: a 12-inch steel deck, Auto Spool Feed that eliminates manual line stretching, and a design owners consistently describe as comfortable during extended use due to reduced vibration. At $69 it undercuts the EWORK while delivering from a brand with established retail and warranty support.
- Pro: Auto Spool Feed removes the frustration of manually advancing trimmer line.
- Pro: Steel deck and reduced vibration design noted repeatedly in owner reviews.
- Con: 12-inch head covers less ground per pass than the 13-inch or 40V options.
Skip it if you routinely cut through thick brush or tall weeds; the 20V platform is optimized for lawn maintenance, not clearing overgrowth.
Buying Guide
Voltage and Battery Capacity Work as a System
Higher voltage means more torque available to the head, but a low-capacity battery (measured in Ah) will starve a high-voltage motor in minutes. A 40V tool with a small Ah pack can run out faster than a 20V tool with a 4.0Ah or 6.0Ah pack. Look at the ratio: a trimmer advertised at 20V with 2.0Ah suits ten minutes of light work, while 20V at 6.0Ah extends that window into a full session without swapping. If a product lists only one battery, budget the cost of a second before purchase.
Cut Swath Width Determines Real Job Time
A 12-inch swath means two passes to cover the ground a 13-inch head covers in one-and-a-half passes. That difference compounds over a long fenceline or large border. However, wider heads draw more power from the same battery, so a 13-inch swath on a 20V/2.0Ah combination may produce shorter runtime than a 12-inch swath on the same platform. Match head width to battery capacity, not just to personal preference for larger coverage.
Weight and Ergonomics Matter Over a Full Session
Published weights typically omit the battery. A 5-pound trimmer head plus a 2-pound battery pack means seven pounds held at arm’s length for fifteen minutes or more. Telescoping shafts adjust the working length to your body, reducing shoulder and back load. Fixed shafts are lighter but force taller users to hunch. If you have a larger yard or physical limitations, prioritize adjustable shafts and models owners describe as balanced rather than relying on the listed number alone.
Our Verdict
The top pick is the WeGofly 4-in-1. At $85.99 it delivers four heads, steel gears, dual 6.0Ah batteries, and a charger—a package whose combined value exceeds what you would spend assembling separate tools. For most buyers the LST300 is the smarter single-function choice: it trims well, feeds line automatically, and carries a recognizable brand warranty.
As a budget pick, the MZK 20V at $49.99 gives you the longest runtime per dollar thanks to its 4.0Ah pack. The one condition under which another product clearly wins: if your yard is a half-acre or larger with thick edges and uneven terrain, the BLACK+DECKER LST136 at 40V justifies its price through sustained power and the telescoping shaft that keeps you comfortable through the full job.
FAQ
How long does a 20V battery trimmer last on a full charge?
With a standard 2.0Ah pack, expect roughly 10-15 minutes of continuous cutting before the battery needs a recharge. Larger 4.0Ah or 6.0Ah cells can stretch that into 30-40 minutes depending on grass density and how much load the head carries.
Can I use one brand’s battery in a different brand’s trimmer?
No. Battery platforms are proprietary; a Ryobi pack will not fit a WORX tool and vice versa. Check what battery ecosystem you already own before choosing a new trimmer, because the platform lock-in affects future purchase decisions more than any single spec.
Is a 4-in-1 tool better than buying separate trimmers?
For small-to-medium yards with varied tasks, a 4-in-1 saves storage space and cost compared to four dedicated tools. For buyers who specialize in one task or demand peak performance per function, a dedicated single-head trimmer will feel lighter, more balanced, and more refined in daily use.
How do I know if a trimmer’s line is easy to replace?
Most battery trimmers use universal 0.065- or 0.080-inch round or twisted line available at any hardware store. The Auto Spool Feed systems on tools like the LST300 advance line automatically, while bump-feed heads require you to tap the ground to extend it. Owners on forums consistently rank Auto Spool Feed as the most convenient feature on mid-price trimmers.
